Jessica Alba's girls are headed back to school looking so grown up! On Monday, the 42-year-old actress took to her Instagram to share a first day of school photo of her two daughters, 15-year-old Honor and 12-year-old Haven. "10th and 7th — where did the time go… (sigh) my baby girls first day of school! #momlifeisthebestlife #summerisofficiallyover #firstdayofschool," Jessica penned in the sweet caption. The sisters leaned into each other and laughed in one of the pics, with Honor rocking loose-fit jeans, a white crop top and sneakers, while Haven sported black baggy cargo pants, a baby blue tank top and sneakers. The Honest Company founder shares her daughters and 5-year-old son Hayes with husband Cash Warren. The couple met on the set of "Fantastic Four" in 2004. They got engaged in 2007 and eloped in 2008 when Jessica was pregnant with Honor.